Matrix Effect
Interference in hormone assays caused by sample components other than the target analyte, potentially affecting result accuracy.
Full Definition
Matrix effects occur when components of the biological sample (serum, plasma, or urine) interfere with the analytical measurement of hormones, leading to artificially elevated or suppressed results. Common matrix effects include protein binding alterations, viscosity changes, ionic strength variations, and the presence of interfering substances like heterophile antibodies, cross-reactive medications, or endogenous compounds. These effects are particularly problematic in immunoassays where binding proteins or similar molecules may compete with or enhance antibody-antigen interactions. Understanding matrix effects is crucial for proper result interpretation, especially when results are discordant with clinical presentation or when comparing results between different analytical platforms.
Usage
Usage note: Consider matrix effects when results are unexpectedly discordant with clinical findings.
In Context
- "Suspected matrix effects prompted repeat testing using a different analytical platform for confirmation." — Laboratory investigation report
- "The patient's extremely high protein levels may cause matrix effects in the testosterone immunoassay." — Clinical correlation discussion